Changing state

The video tutorial explains the states of matter: solid, liquid, and gas. It describes how matter can change states through heating or cooling. Solids melt into liquids when heated, and liquids evaporate into gases. The process of evaporation can occur even at temperatures below boiling point. Practical examples, such as a snowman melting, are used to illustrate these concepts.

What is the term used to describe whether a substance is solid, liquid, or gas?

• States of Matter

• Forms of Energy

• Phases of Elements

• Types of Compounds

What happens to the molecules of a solid when it is heated?

• They vibrate and move freely

• They become larger

• They stop moving

• They change color

At what temperature does liquid water turn into steam?

• 100°C

• 0°C

• 50°C

• 150°C

What is the process called when a liquid turns into a gas?

• Sublimation

• Evaporation

• Condensation

• Freezing

Why do puddles disappear over time?

• They are blown away by the wind

• They freeze

• They are absorbed by the ground

• They evaporate